Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7456ad7e0021766…

MALICIOUS

PDF

91.6 KB Created: 2021-07-20 23:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7552eaf12fdc00edcba852d573714328 SHA-1: e54a7b161397982f15842b8e5279d92a96840f2b SHA-256: e7456ad7e00217663104593da19ca0a581ee1b592b7e00d73722827a7ac87465
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised hosting is sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/0ba5a5aefd1f41734820b90629780fdd/filewewerurebuminedu.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87752aff6---siseregorabetepakufubasa.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094309fef8fb---sokogesigopuzisiwevozonim.pdf
    • http://fixafilm.se/userfiles/file/mimiripowivi.pdf
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naligukadepalurep.pdf
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710152010436620.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/2b1aakm8ct4crc25gcoi1hcgeb/26007180004.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d315c62077c95acafabaf76ad6486a32/9137822128.pdf
    • http://asiadomainstore.com/userfiles/file/75401476112.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/17531588263.pdf
    • http://a-aqua.fr/ressource/site-image/files/66887861344.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/p7qbbl37lnh3k6n5fqaq5lvu93/91232991101.pdf
    • http://telekommarketing.com/firme_data/files/63963120093.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4e501e85a---vasuzomo.pdf
    • http://studiotrusso.it/userfiles/files/55100041740.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/kabokaropiwedujikebuve.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0b85c44c4b4f0e2866cb1286b182d04a/bofigi.pdf
    • https://raljob.com/userfiles/file/latilarakaba.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781e2312372---dezuzov.pdf
    • http://crm333.com/documentos/file/17158457105.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa74dcf6cc---81918889426.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/21e31809fbb1030c2db291d9ccaee504/46432111498.pdf
    • http://quickvideo.nl/userfiles/file/tifuditigetamakixeponixes.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/vhr4f19nvriuan5ev23lf9lbp0/varolurokisawozakixajod.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794e5fa7f24---72154292811.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160be60d68634a---fuzuziwopevopojapoja.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=testing+analyst+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 16792 bytes
font_01_sfnt_off00011c10.bin
4ceba3bd7f7adb5e87a44beca0639795b9b82e600527ffca3aba2af97515610d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 10896 bytes
font_02_sfnt_off000134fd.bin
8b2c0292dd3aef7682bdf12ba78005f9f088fd32e085ae8a29544400536a5624
pdf-font-stream PDF embedded font (sfnt) at offset 0x134FD 16820 bytes